Dam-gate hoist.



PATENTED JULY 3, 1906.

W MQEIARTY.

DAM, GATE HOIST.

APPLICATION FILED NOV. 9, 1905.

Fig. I

Figs

Fig. 6

Jul/6717307" Witnesses @4 14;

Tn: NORRIS PETERS co, wusnmamu, n. c.

IVILLIAM MORIARTY, OF NORCROSS,

MAINE, ASSIGNOR OF ONE-HALF TO GEORGE J. MAHER, OF MILLINOOKET, MAINE.

DAM-GATE HOIST.

Specification of Letters Patent.

Patented July 3. 1906.

Application filed November 9,1905- Serial NO- 2861520- To all whom it may concern.-

Be it known thatI, WILLIAM MORIARTY, a citizen of the United States, residing at Norcross, in the county of Penobscot and State of Maine, have invented certain new and useful Improvements in Dam-Gate Hoists and I do hereby declare the following to be a full,

clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same.

My invention consists of an improved damgate hoist and is fully shown in the accompanying drawings, in which Figure I is an isometric view of sluice, gate, and hoist with gate hoisted. Fig. 2 is a side elevation of standard C. Fig. 3 is a front elevation of same. Fig. 4 is a front elevation of standard C. Fig. 5 is a side elevation of same. Fig. 6 is a side elevation of lifting-lever with spring-pawl. Fig. 7 is a plan of same. Fig. 8 is a side elevation of holdingpawl. Fig, 9 is a plan of same.

Similar letters refer to corresponding parts throughout the figures.

The object of my invention is to provide means of quickly and easily raising and lowering the gates of dams, and it is designed more especially for use upon dams used in connection with storing water for driving logs in remote districts of the forests. Such dams are generally unprovided with hoisting or lowering devices and frequently require the services of several men when it is necessary to op erate them; but I have provided a device whereby one man may travel from dam to dam and from gate to gate and accomplish all that now requires the services of several.

An important feature of my device is the detachable lever, spring-pawl, and holdingpawl, one set of which is all that is required irrespective of the number of dams or gates and which can easily be carried by one man from gate to gate and from dam to dam.

In Fig. 1, Ais the dam B, the gate; 6, a rack fixed perpendicularly upon the gate-frame. O is a standard upon the downstream side of the sluice-deck a, in which are journaled the hoisting-lever D, with spring-pawl d, and the holding-pawl e, with its lever E so placed and arranged as to engage with the rack. The holding-pawl e is limited in forward and backward motion by stops at :0, as shown in Fig. 8.

Considering for the present those parts only which so far have been referred to, the operation of the device is as follows: The lever D be ing operated, the pawl (Z engages with the rack 11 and the gate is hoisted, and when the operation ceases the holding-pawl 6 falls between two teeth of the rack and holds the distance gained. WVhen it is desired to lower the gate, the lever D is disengaged from the rack, and the holding-lever E being operated the pawl 6 passes out of the rack, and as it is prevented by the stop as from falling forward and engaging again with the rack the gate falls. If the rush of water through the sluice is very strong, it is sometimes difl'icult to lower the gate, and to meet this difficulty I have provided a lowering device which is simply the hoisting device reversed and, as shown in Fig. 1, consists of the lever D, with springpawl d, journaled in the standard O and so placed and arranged as to engage with the reversed rack l), and here the lever is operated by lifting, and no holding-pawl is required. As when the hoisting or lowering lever is operated the gate is pushed back against the frame and tends to bind and stick, I have provided the antifriction-roll F.

The hoisting and lowering levers, with their pawls, are made with shorthollow metal shanks, to the front ends of which the pawls are attached and into the rear of which the wooden handle-bars or levers can be inserted and removed, and the shanks themselves are detachably journaled in bearings in the standards, so that the gates being permanently fitted with racks and the sluice-decks with standards the handle may be removed from the shanks and the shanks, together with their pawls, detached from their standards and easily carried from place to place. The same is true of the shank, with its hold ing-pawl.

My holding-pawl E possesses two novel featuresviz., first, the stops :1; x, which limit and control the forward and backward motion of the pawl, the stop as preventing the pawl from being thrown backward out of the rack when the lever is not operated and the stop a preventing the pawl from falling for ward when the lever is operated to drop the gate; second, the spur 9 upon the under side of the shank fitting into .and bearing upon the spiral spring hupon the sluice-deck, whereby the holding-pawl is returned to position to engage with the rack after the gate has been dropped.

By means of this device one man carrying the shanks, with pawls attached, of the hoisting-lever and the holding-lever can travel from place to place and do the work of per haps five or siX men.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The herein-described dam-gate hoist, consisting of the combination of the dam the sluice; the gate; a rack set perpendicularly upon the gate-frame; a standard upon the sluicedeck; a hoisting-lever detachably journaled in said standard and having a spring-pawl adapted to engage said rack; and

a holding-lever with pawl also detachably journaled in said standard and adapted to engage said rack.

2. The herein-described dam-gate hoist, consisting of the combination of the dam; the sluice; the gate; a rack set perpendicularly upon the gate-frame; a standard upon the sluice-deck; a hoisting-lever detachably j ournaled in said standard and having a springpawl adapted to engage said rack; a holdinglever detachably journaled in said standard and adapted to engage said rack, and having a pawl pivoted between two stops so placed as to limit and control the motion of the pawl; and a spring acting between the under side of the shank of the holding-lever and the sluicedeck.

WILLIAM MORIARTY.

WVitnesses:

GUY S. BAKER, GEORGE W. STEARNS. 

